“What is brain matter? Brain matter is simply abandonded bowel matter. The brains premature segerations pass through the guts. The content of the bowel is indeed related to the brains content.
If i were to talk bizarrely, i would say, an advanced dungheap is what is spreading in the brain; but its quite correct.” (Rudolf Steiner)
Source: Rudolf Steiner, “Lectures on natural science”, GA327, page 201